fix IPv6 loopback pattern

In /proc/net/udp6 and /proc/net/tcp6, the addresses stored
in that file are in network byte order.  As a result, the IPv6
loopback address, ::1, is stored as
00000000000000000000000001000000 NOT
00000000000000000000000000000001

Bug: 5473686
Change-Id: I73098d52c981c48d82423c8ce99b6b20d11a5568
diff --git a/tests/tests/net/src/android/net/cts/ListeningPortsTest.java b/tests/tests/net/src/android/net/cts/ListeningPortsTest.java
index 5c1ba7c..bcec0fe 100644
--- a/tests/tests/net/src/android/net/cts/ListeningPortsTest.java
+++ b/tests/tests/net/src/android/net/cts/ListeningPortsTest.java
@@ -46,7 +46,7 @@
         EXCEPTION_PATTERNS.add("[0-9A-F]{6}7F:[0-9A-F]{4}"); // IPv4 Loopback
 
         // IPv6 exceptions
-        EXCEPTION_PATTERNS.add("[0]{31}1:[0-9A-F]{4}"); // IPv6 Loopback
+        EXCEPTION_PATTERNS.add("[0]{25}1[0]{6}:[0-9A-F]{4}"); // IPv6 Loopback
         EXCEPTION_PATTERNS.add("[0]{16}[0]{4}[0]{4}[0-9A-F]{6}7F:[0-9A-F]{4}"); // IPv4-6 Conversion
         EXCEPTION_PATTERNS.add("[0]{16}[F]{4}[0]{4}[0-9A-F]{6}7F:[0-9A-F]{4}"); // IPv4-6 Conversion
     }